
#ifndef HEADER_COMP_H
#define HEADER_COMP_H

#include <openssl/crypto.h>

#ifdef  __cplusplus
extern "C" {
#endif

typedef struct comp_ctx_st COMP_CTX;

typedef struct comp_method_st {
    int type;                   /* NID for compression library */
    const char *name;           /* A text string to identify the library */
    int (*init)(COMP_CTX *ctx);
    void (*finish)(COMP_CTX *ctx);
    int (*compress)(COMP_CTX *ctx,
                    unsigned char *out, unsigned int olen,
                    unsigned char *in, unsigned int ilen);
    int (*expand)(COMP_CTX *ctx,
                  unsigned char *out, unsigned int olen,
                  unsigned char *in, unsigned int ilen);
    /* The following two do NOTHING, but are kept for backward compatibility */
    long (*ctrl)(void);
    long (*callback_ctrl)(void);
} COMP_METHOD;

struct comp_ctx_st {
    COMP_METHOD *meth;
    unsigned long compress_in;
    unsigned long compress_out;
    unsigned long expand_in;
    unsigned long expand_out;

    CRYPTO_EX_DATA ex_data;
};

COMP_CTX * COMP_CTX_new(COMP_METHOD *meth);
void COMP_CTX_free(COMP_CTX *ctx);
int COMP_compress_block(COMP_CTX * ctx, unsigned char *out, int olen,
                        unsigned char *in, int ilen);
int COMP_expand_block(COMP_CTX * ctx, unsigned char *out, int olen,
                      unsigned char *in, int ilen);
COMP_METHOD * COMP_rle(void);
COMP_METHOD * COMP_zlib(void);
void COMP_zlib_cleanup(void);

#ifdef HEADER_BIO_H
#ifdef ZLIB
BIO_METHOD * BIO_f_zlib(void);
#endif
#endif

/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_COMP_strings(void);

/* Error codes for the COMP functions. */

/* Function codes. */
#define COMP_F_BIO_ZLIB_FLUSH     99
#define COMP_F_BIO_ZLIB_NEW       100
#define COMP_F_BIO_ZLIB_READ      101
#define COMP_F_BIO_ZLIB_WRITE     102

/* Reason codes. */
#define COMP_R_ZLIB_DEFLATE_ERROR 99
#define COMP_R_ZLIB_INFLATE_ERROR 100
#define COMP_R_ZLIB_NOT_SUPPORTED 101

#ifdef  __cplusplus
}
#endif
#endif
